Between brackets is the number of accepted species

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- Mollusca (132 791)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 009)
- Class Caudofoveata (143)
- Class Cephalopoda (1 834)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 697)
- Subclass Amphigastropoda † (390)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 636)
- Subclass Gastropoda incertae sedis (308)
- Subclass Heterobranchia (39 156)
- Infraclass "Lower Heterobranchia" (1 137)
- Infraclass Euthyneura (37 433)
- Subterclass Acteonimorpha (411)
- Subterclass Ringipleura (2 917)
- Subterclass Tectipleura (34 105)
- Superorder Acochlidiimorpha (48)
- Superorder Ascoglossa accepted as Sacoglossa
- Superorder Basommatophora accepted as Hygrophila
- Superorder Eupulmonata (25 569)
- Order Aillyida accepted as Achatinina
- Order Ellobiida (579)
- Order Gymnomorpha accepted as Systellommatophora
- Order Stylommatophora (24 766)
- Suborder Achatinina (2 900)
- Suborder Elasmognatha accepted as Succineoidei
- Suborder Helicina (21 626)
- Infraorder Arionoidei (140)
- Infraorder Clausilioidei (1 859)
- Infraorder Helicina incertae sedis (3 210)
- Infraorder Helicoidei (5 690)
- Infraorder Limacoidei (4 251)
- Infraorder Oleacinoidei (497)
- Infraorder Orthalicoidei (1 578)
- Superfamily Bulimuloidea Tryon, 1867 accepted as Orthalicoidea E. von Martens, 1860
- Superfamily Orthalicoidea E. von Martens, 1860 (1 578)
- Family Amphibulimidae P. Fischer, 1873 (109)
- Family Bothriembryontidae Iredale, 1937 (168)
- Subfamily Bothriembryontidae incertae sedis (5)
- Subfamily Bothriembryontinae Iredale, 1937 (143)
- Genus Acrostylus Clench, 1935 accepted as Malaitella Clench, 1941
- Genus Archaeostylus Brook & B. W. Hayward, 2022 † (1)
- Genus Aspastus Albers, 1850 (3)
- Genus Basileostylus F. Haas, 1935 (1)
- Genus Bothriembryon Pilsbry, 1894 (65)
- Genus Callistocharis Pilsbry, 1900 (12)
- Genus Charis Albers, 1850 accepted as Callistocharis Pilsbry, 1900
- Genus Diplomorpha Ancey, 1884 (5)
- Genus Eumecostylus E. von Martens, 1860 (29)
- Species Eumecostylus acutus (Clench, 1935)
- Species Eumecostylus almiranta (Clench, 1941)
- Species Eumecostylus calus (E. A. Smith, 1892)
- Species Eumecostylus cleryi (Petit de la Saussaye, 1850)
- Species Eumecostylus cylindricus (Fulton, 1907)
- Species Eumecostylus founaki (Hombron & Jacquinot, 1847)
- Species Eumecostylus foxi (Clench, 1950)
- Species Eumecostylus fraterculus (B. Rensch, 1934)
- Species Eumecostylus gallegoi (Clench, 1941)
- Species Eumecostylus gardneri Delsaerdt, 2010
- Species Eumecostylus guppyi (E. A. Smith, 1892)
- Species Eumecostylus hargravesi (J. C. Cox, 1871)
- Species Eumecostylus kirakiraensis (B. Rensch, 1934)
- Species Eumecostylus kreftii (J. C. Cox, 1872)
- Species Eumecostylus macfarlandi (Brazier, 1876)
- Species Eumecostylus macgillivrayi (L. Pfeiffer, 1855)
- Species Eumecostylus malaitensis (Clench, 1941)
- Species Eumecostylus manni (W. F. Clapp, 1923)
- Species Eumecostylus ophir (Clench, 1941)
- Species Eumecostylus palmarum (Mousson, 1869)
- Species Eumecostylus paravicinianus (B. Rensch, 1934)
- Species Eumecostylus phenax (W. F. Clapp, 1923)
- Species Eumecostylus sanchristovalensis (J. C. Cox, 1870)
- Species Eumecostylus scottii (J. C. Cox, 1873)
- Species Eumecostylus strangei (L. Pfeiffer, 1855)
- Species Eumecostylus stutchburyi (L. Pfeiffer, 1860)
- Species Eumecostylus uliginosus (Kobelt, 1891)
- Species Eumecostylus unicus (B. Rensch, 1934)
- Species Eumecostylus vicinus (B. Rensch, 1934)
- Subspecies Eumecostylus vicinus backhuysi Delsaerdt, 2010
- Subspecies Eumecostylus vicinus vicinus (B. Rensch, 1934)
- Genus Euplacostylus Crosse, 1875 (4)
- Genus Hebridaria Pilsbry, 1900 accepted as Diplomorpha Ancey, 1884
- Genus Leucocharis Pilsbry, 1900 (3)
- Genus Liparus Albers, 1850 accepted as Bothriembryon Pilsbry, 1894
- Genus Malaitella Clench, 1941 accepted as Eumecostylus E. von Martens, 1860
- Genus Maoristylus F. Haas, 1935 (5)
- Genus Placocharis Pilsbry, 1900 accepted as Eumecostylus E. von Martens, 1860
- Genus Placostylus H. Beck, 1837 (9)
- Genus Poecilocharis Kobelt, 1891 (2)
- Genus Proaspastus Clench, 1941 accepted as Eumecostylus E. von Martens, 1860
- Genus Quiros Solem, 1959 (1)
- Genus Santacharis Iredale, 1927 (3)
- Subfamily Placostylinae Pilsbry, 1946 accepted as Bothriembryontinae Iredale, 1937
- Subfamily Prestonellinae van Bruggen, D. G. Herbert & Breure, 2016 (20)
- Family Bulimulidae Tryon, 1867 (940)
- Family Cyclodontinidae Salvador & Breure, 2023 (110)
- Family Liguidae Pilsbry, 1891 accepted as Orthalicidae E. von Martens, 1860
- Family Megaspiridae Pilsbry, 1904 (58)
- Family Orthalicidae E. von Martens, 1860 (108)
- Family Placostylidae Pilsbry, 1946 accepted as Placostylinae Pilsbry, 1946
- Family Simpulopsidae Schileyko, 1999 (61)
- Family Tomogeridae Jousseaume, 1877 (24)
- Infraorder Partuloinei accepted as Pupilloidei
- Infraorder Pupilloidei (3 436)
- Infraorder Rhytidoidei (581)
- Infraorder Sagdoinei accepted as Helicoidei
- Infraorder Succineoidei (384)
- Suborder Orthurethra accepted as Pupilloidei
- Suborder Scolodontina (165)
- Suborder Sigmurethra accepted as Helicina
- Suborder Stylommatophora incertae sedis (75)
- Order Systellommatophora (224)
- Superorder Hygrophila (2 005)
- Superorder Pneumopulmonata
- Superorder Pylopulmonata (4 285)
- Superorder Sacoglossa (391)
- Superorder Siphonarimorpha (163)
- Order Anaspidea accepted as Aplysiida
- Order Aplysiida (101)
- Order Aplysiomorpha accepted as Aplysiida
- Order Archaeopulmonata accepted as Siphonarioidea Gray, 1827
- Order Bullomorpha accepted as Cephalaspidea
- Order Cephalaspidea (1 034)
- Order Heterostropha accepted as Pyramidellidae J. E. Gray, 1840
- Order Pteropoda (414)
- Order Runcinacea accepted as Runcinida
- Order Runcinida (80)
- Order Tectibranchiata
- Order Thecosomata
- Order Umbraculida (15)
- Superorder Euthyneura incertae sedis
- Infraclass Heterobranchia incertae sedis (478)
- Infraclass Mesoneura (108)
- Infraclass Opisthobranchia
- Infraclass Pulmonata
- Subclass Neomphaliones accepted as Vetigastropoda
- Subclass Neritimorpha (1 914)
- Subclass Orthogastropoda represented as Gastropoda
- Subclass Patellogastropoda (511)
- Subclass Prosobranchia
- Subclass Psilogastropoda represented as Gastropoda
- Subclass Vetigastropoda (6 782)
- Class Lamellibranchiata accepted as Bivalvia
- Class Loricata accepted as Polyplacophora
- Class Mollusca incertae sedis † (372)
- Class Monoplacophora (229)
- Class Pelecypoda accepted as Bivalvia
- Class Polyplacophora (1 377)
- Class Polyplaxiphora accepted as Polyplacophora
- Class Rostroconchia † (64)
- Class Scaphopoda (752)
- Class Solenoconchia accepted as Scaphopoda
- Class Solenogastres (313)
- Subclass Chaetodermomorpha accepted as Caudofoveata